Grundfos CUE Series Service Instructions Manual

CUE Series
Grundfos
Brand
Grundfos
Model
CUE Series
Type
Service Instructions Manual
CUE
Service instructions
GRUNDFOS INSTRUCTIONS
English (GB)
2
English (GB) Service instructions
Original service instructions
CONTENTS
Page
1. General information
1.1 Hazard statements
The symbols and hazard statements below may appear in
Grundfos installation and operating instructions, safety
instructions and service instructions.
The hazard statements are structured in the following way:
1.2 Notes
The symbols and notes below may appear in Grundfos
installation and operating instructions, safety instructions and
service instructions.
1. General information
2
1.1 Hazard statements
2
1.2 Notes
2
1.3 About the service instructions
3
1.4 Waiting time during power off
3
2. Type identification
4
2.1 Nameplate
4
2.2 Enclosures
4
2.3 Schematic diagram
5
2.4 Terminals
5
3. Fault finding
7
3.1 Safety regulations
7
3.2 Fault finding procedure
7
3.3 Operating conditions
7
3.4 Fault finding using alarm and warning codes
8
4. Checking the mains components
19
4.1 Checking the rectifier, static test
20
4.2 Checking the IGBTs, static test
21
4.3 Checking the IGBTs, dynamic test
23
4.4 Checking the intermediate voltage
23
4.5 Checking the current sensor
24
4.6 Setting the type code
24
4.7 Fault finding using PC Tool E-Products
25
5. Upgrading the firmware
26
6. Additional information
26
6.1 Special service tools
26
6.2 Tightening torques
26
Read this document before starting service work on
the product. Installation and service work must
comply with local regulations and accepted codes of
good practice.
Observe the safety instructions in the installation and
operating instructions for the product.
DANGER
Indicates a hazardous situation which, if not avoided,
will result in death or serious personal injury.
WARNING
Indicates a hazardous situation which, if not avoided,
could result in death or serious personal injury.
CAUTION
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate personal injury.
SIGNAL WORD
Description of hazard
Consequence of ignoring the warning.
- Action to avoid the hazard.
Observe these instructions for explosion-proof
products.
A blue or grey circle with a white graphical symbol
indicates that an action must be taken.
A red or grey circle with a diagonal bar, possibly with
a black graphical symbol, indicates that an action
must not be taken or must be stopped.
If these instructions are not observed, it may result in
malfunction or damage to the equipment.
Tips and advice that make the work easier.
English (GB)
3
1.3 About the service instructions
These service instructions describe the recommended procedure
for fault finding of CUE and its interface.
The instructions are aimed at Grundfos service technicians that
are trained as a Grundfos Service Electronic Expert (GESE).
These service technicians have received electrotechnical
training.
Contact your local Grundfos service centre for more information.
Usage of these instructions presuppose knowledge of these
documents:
1. installation and operating instructions of CUE
2. installation and operating instructions of the system which
CUE is part of or controls.
These instructions only deal with CUE and its interface. If the
application includes other Grundfos products or other systems,
refer to the instructions for these products.
If the fault cannot be remedied by means of these instructions, or
you require technical assistance, contact Grundfos.
If it has been proven that the fault is in CUE, contact Grundfos.
Spare parts can be found in Grundfos Product Center, GPC or in
GSK, Grundfos Service Knowledge.
You must state these pieces of information when you contact
Grundfos to get help for fault finding:
• nameplate data of the pump or system which CUE controls or
is part of
• nameplate data of CUE
• status of the indicator lights on the operating panel
• any alarm or warning text and the code number on the display.
These instructions are made public and maintained in GSK.
1.4 Waiting time during power off
Only wait for a shorter period of time if stated on the nameplate of
the product in question.
Voltage Min. waiting time
4 minutes 15 minutes 20 minutes
200-240 V
0.75 - 3.7 kW
(1-5 hp)
5.5 - 45 kW
(7.5 - 60 hp)
380-500 V
0.55 - 7.5 kW
(0.75 - 10 hp)
11-90 kW
(15-125 hp)
110-250 kW
(150-350 hp)
525-600 V
0.75 - 7.5 kW
(1-10 hp)
525-690 V
11-250 kW
(15-350 hp)
English (GB)
4
2. Type identification
2.1 Nameplate
CUE can be identified by means of the nameplate.
Fig. 1 Nameplate
2.2 Enclosures
The table shows the enclosures of the CUE product range. The
technical information is based on the enclosure of the CUE in
question.
The enclosure can be identified on the basis of typical shaft
power, voltage and IP class.
Example
Read from the nameplate:
• Supply voltage = 3 x 380-500 V.
• Typical shaft power 1.5 kW.
• Enclosure class = IP20.
From the table it can be seen that the CUE enclosure is A2.
TM07 5227 3519
Text Description
T/C (type code)
CUE (product name).
202P1M2T5E20H1BXCXXXSXXXXAXBXCXXXXDX
Prod. no. Product number: 12345678
S/N
Serial number: 123456
Place of production: G = Gråsten
Date of production: 439 = week 43, 2019
1.5 kW (400 V) Typical shaft power on the motor at 400 V
IN Supply voltage, frequency and maximum input current
OUT
Motor voltage, frequency and maximum output current.
The maximum output frequency usually depends on the
pump type.
CHASSIS/IP20
Tamb.
Enclosure class.
Maximum ambient temperature.
T/C: CUE202P1M2T5E20H1BXCXXXSXXXXAXBXCXXXXDX
Prod. no: 12345678
S/N: 123456G234
IN: 3x380-500 V 50/60Hz 3.7A
OUT: 3x0-Vin 0-100Hz 4.1 A 2.8 kVA
CHASSIS/IP20 Tamb. 45C/122F
IIIIIIIIIIIBAR CODEIIIIIIIIIII
MADE IN DENMARK
Listed 76X1 E134261 Ind. Contr. Eq.
See manual for prefuse
CAUTION:
SEE MANUAL / VOIR MANUEL
WARNING:
STORED CHARGE DO NOT TOUCH UNTIL
4 MIN AFTER DISCONNECTION
CHARGE RESIDUELLE, ATTENDRE
4 MIN APRES DECONNEXION
1.5 kW (400V) / 2 Hp (460V)
T/C: CUE202P1M2T5E20H1BXCXXXSXXXXAXBXCXXXXDX
Prod. no: 12345678
S/N: 123456G439
IN: 3x380-500 V 50/60Hz 3.7A
OUT: 3x0-Vin 0-100Hz 4.1 A 2.8 kVA
CHASSIS/IP20 Tamb. 45C/122F
IIIIIIIIIIIBAR CODEIIIIIIIIIII
MADE IN DENMARK
Listed 76X1 E134261 Ind. Contr. Eq.
See manual for prefuse
CAUTION:
SEE MANUAL / VOIR MANUEL
WARNING:
STORED CHARGE DO NOT TOUCH UNTIL
4 MIN AFTER DISCONNECTION
CHARGE RESIDUELLE, ATTENDRE
4 MIN APRES DECONNEXION
1.5 kW (400V) / 2 Hp (460V)
Typical shaft
power
P
2
Enclosure
1 x 200-240 V 3 x 200-240 V 3 x 380-500 V 3 x 525-600 V 3 x 525-690 V
[kW] [hp] IP20 IP21 IP55 IP20 IP55 IP20 IP55 IP20 IP55 IP21 IP55
0.55 0.75
A2 A5
0.75 1
A2
A5
A3 A5
1.1 1.5
A3 A5
1.5 2
B1 B1
2.2 3
34
A3
3.7 5
45
A2
A5 A3 A55.5 7.5 B1 B1
B3 B1
A3
7.5 10
B2 B2
11 15
B3 B1 B3 B1
B2 B2
15 20
B4
B2
18.5 25
C122 30
C3
B4
B2
B4
B2
30 40
37 50
C4 C2
C1 C1
C2 C2
45 60
C3 C3
55 75
75 100
C4 C2 C4 C2
90 125
English (GB)
5
2.3 Schematic diagram
Fig. 2 Schematic diagram
2.4 Terminals
The physical position of the terminals depends on the enclosure
of CUE. See the CUE installation and operating instructions.
2.4.1 Mains and motor connection
The wires in the terminal box must be as short as possible.
Excepted from this is the protective earth conductor which must
be so long that it is the last one to be disconnected in case the
cable is inadvertently pulled out of the cable entry.
Fig. 3 Wiring diagram, mains and motor terminals
2.4.2 Wiring diagram, signal terminals
Fig. 4 Wiring diagram, signal terminals
Ext. I/O, relays
CUE
Filter
Supply
Sensors
External control circuit
M
TM03 8799 2507
Terminal Function
91 (L1)
Three-phase supply92 (L2)
93 (L3)
95/99 (PE) Earth connection
96 (U)
Three-phase motor connection, 0-100 % of mains
voltage
97 (V)
98 (W)
TM03 8800 3219
Terminal Type Function
12 +24 V out Supply to sensor
13 +24 V out Additional supply
18 DI 1 Digital input, programmable
19 DI 2 Digital input, programmable
20 GND Common frame for digital inputs
27 DI/O 1 Digital input/output, programmable
29 DI/O 2 Digital input/output, programmable
32 DI 3 Digital input, programmable
33 DI 4 Digital input, programmable
37 Safe stop Safe stop
39 GND Frame for analog output
42 AO 1 Analog output, 0-20 mA
50 +10 V out Supply to potentiometer
53 AI 1 External setpoint, 0-10 V
54 AI 2 Sensor input, sensor 1, 0/4-20 mA
55 GND Common frame for analog inputs
61 RS-485 GND Y GENIbus, screen (frame)
68 RS-485 A GENIbus, signal A (+)
69 RS-485 B GENIbus, signal B (-)
12
54
12
53
55
55
A54A53
61 68 69
61 68 69 42 50 53 54 5539
12 18 3720333229271913
+24 V out
+24 V out
DI 2
DI 3
DI 4
GND
GND
AO 1
+10 V out
Ext. setpoint
Sensor 1
GND
RS-485 GND Y
RS-485 A
RS-485 B
0/4-20 mA
1 K
0-20 mA
0/4-20 mA
0-10 V0-10 V
DI 1
Terminals 53
and 54
The setting
must
correspond to
the signal type
in question:
U: Voltage
I: Current
DI/O 1
DI/O 2
Safe stop
English (GB)
6
2.4.3 Connection of signal relays
Fig. 5 Terminals for signal relays in normal state (not activated)
2.4.4 Wiring diagram, MCB 114
Fig. 6 Wiring diagram, MCB 114
TM03 8801 2507
Terminal Function
C 1 C 2 Common
NO 1 NO 2 Normally open contact
NC 1 NC 2 Normally closed contact
C 1
NC 1
NO 1
NC 2
NO 2
C 2
TM07 5432 4019
Terminal Type Function
1 +24 V out Supply to sensor
2 AI 3 Sensor 2, 0/4-20 mA
3 GND Common frame for analog input
4, 5 AI 4 Temperature sensor 1, Pt100/Pt1000
6GND
Common frame for temperature
sensor 1
7, 8 AI 5 Temperature sensor 2, Pt100/Pt1000
9GND
Common frame for temperature
sensor 2
Terminals 10, 11 and 12 are not used.
1
2
3
4
5
6
7
8
9
10
11
12
0/4-20 mA
+24 V out
Sensor 2
GND
GND
GND
Temperature
sensor 1
Temperature
sensor 2
3-wire
2-wire
English (GB)
7
3. Fault finding
The operational status of CUE and faults are automatically shown
via the indicator lights and the display of the operating panel.
If the alarm light is on, the display shows a code with text which
gives information of the cause. See 3.4.1 Alarm and warning list.
3.1 Safety regulations
3.2 Fault finding procedure
Fault diagnosing and fault correction is based on these sections
in this order:
• 3.3 Operating conditions
• 3.4 Fault finding using alarm and warning codes.
Startup guide
The startup guide
• is started the first time CUE is connected to supply voltage
• can be started in [Favourites] > "Q4" > "Run startup guide"
• will start if CUE is reset to the factory setting.
If CUE is in alarm state, you must carry out fault finding based on
the alarm code before activating the startup guide, if necessary.
An alarm may be caused by wrong settings!
Resetting to factory setting
Before resetting CUE to the factory setting, get a complete
overview of the settings and possible functions required by CUE.
To reset CUE to factory setting, proceed as follows:
1. Switch off the mains supply to CUE.
2. Switch on the mains supply to CUE while you press [Status],
[Main menu] and [OK] simultaneously for at least 3 seconds.
When CUE has been reset to factory setting, go through the
startup guide.
Contacting Grundfos
State these pieces of information when you contact Grundfos to
get help for fault finding:
• nameplate data of the pump or system which CUE controls or
is part of
• nameplate data of CUE
• status of the indicator lights on the operating panel
• any alarm or warning text and the code number on the display.
3.3 Operating conditions
CUE is the controlling unit and will react and control the pump
depending on the following:
Mains supply
• Check nameplate data, and measure the actual voltage supply
with a voltmeter (true RMS).
• Check the earth leakage circuit breaker and the backup fuses.
CUE has no internal fuses.
Pump and motor load
• Check nameplate data, and measure the actual current
consumption with an amperemeter (true RMS).
Does the pump and CUE match?
External signals, for instance from another controller
• Check that the external signals match CUE. See section
2.4.2 Wiring diagram, signal terminals and the CUE
installation and operating instructions.
• Check that terminals 18 and 20 are connected and CUE has
been started via the operating panel.
Sensors connected
• Check that the sensor measuring range matches the pump
application.
• Check that the settings of CUE match the sensors (current,
voltage, minimum and maximum values).
Electromagnetic disturbances
• Check that the cable run is EMC-correct. See the CUE
installation and operating instructions.
Startup, installation and operating settings are made via the
operating panel.
• Check whether the signal indicator On on the operating panel
is lit.
• Go through the startup guide at startup. If the startup guide is
activated later on, the settings made will be reset. Set CUE to
the correct values for the pump application. The startup guide
is described in detail in the CUE installation and operating
instructions.
• Check that the settings in the installation menu match the
pump application. (The displays are described in detail in the
CUE installation and operating instructions.)
• Check the status display of the operating panel if the pump
has stopped.
If the above items are according to the CUE installation and
operating instructions and the pump application, but a fault still
exists, continue the fault finding in section 3.4 Fault finding using
alarm and warning codes.
WARNING
Electric shock
Death or serious personal injury
- Do not use the OFF button on the operating panel
as a safety switch.
- All service work must be carried out by trained
persons.
- Due to the capacitors of CUE, touching the
electrical parts may be fatal, even after the mains
supply has been switched off.
- Switch off the mains supply, and wait at least as
long as stated on the nameplate before touching
electrical parts.
- Note that the relay may be connected to an
external voltage supply and still be current-
carrying even after the mains supply has been
disconnected.
English (GB)
8
3.4 Fault finding using alarm and warning codes
Besides being indicated by the indicator lights on the operating
panel, faults are also shown as codes in the display.
3.4.1 Alarm and warning list
The list gives you an overview of the possible alarms and
warnings and a description of the causes and suggestions for
remedy.
These abbreviations are used in the column "Type":
W: Warning.
A: Alarm.
L: Locked alarm: The alarm cannot be reset until the mains
supply has been switched off.
1): The action in case of alarm depends on the pump type.
Alarm
code
Description Cause Remedy Type
110 V low
The control card voltage is below 10 V from terminal
50.
Remove some of the load from terminal 50, as the
10 V supply is overloaded.
Maximum. 15 mA or minimum 590 Ω.
This condition can be caused by a short in a
connected potentiometer or improper wiring of the
potentiometer.
Remove the wiring from terminal 50. If the
warning clears, the problem is with the
customer wiring. If the warning does not
clear, replace the control card.
W
2 Live zero error
Sensor 1 (terminal 54):
The analog input signal has fallen below these
control values for more than 500 ms:
Type: 4-20 mA: Alarm under 2 mA (reset over 3
mA).
Type: 2-10 V: Alarm under 1 V (reset over 1.5 V).
The types 0-20 mA and 0-10 V are not monitored.
W/A
Fault at startup:
1. The setting of contact A54 for selection of signal
type is incorrect.
Set the contact correctly according to
section "Connection of a thermistor (PTC) to
CUE" in the CUE installation and operating
instructions.
2. The setting is incorrect for the sensor. Correct the sensor settings.
3. The sensor connection is incorrect. Connect the sensor correctly according to
section "Wiring diagram, signal terminals" in
the CUE installation and operating
instructions.
Fault after startup:
1. Incorrect supply voltage to sensor. Check that there are 24 ± 1 VDC between
terminals 12 and 55:
• If the voltage is not okay, contact
Grundfos Service.
• If the voltage is okay, check if there is
minimum 4 mA or 1 V between terminals
54 and 55. If yes, contact Grundfos
Service.
2. Sensor is defective or sensor cable is missing. If the cable is missing, or the sensor is
defective, contact Grundfos Service.
3No motor
No motor has been connected to the output of the
adjustable frequency drive. This warning or alarm
will only appear if programmed by the user in
parameter 1-80, Function at Stop.
Check the connection between the drive and
the motor.
W/A
English (GB)
9
4 Mains phase loss
Missing phase, or the supply voltage unbalance is
too high.
Re-establish the voltage supply to CUE
according to the nameplate.
If the fuses blow again or the alarm cannot
be reset, contact Grundfos Service.
• Check for unbalance between the phases
by reducing the load.
If the fault disappears by reducing the
speed to 30 %, the cause is unbalance.
• Check and tighten all supply terminals.
• Contact the electricity supply authorities.
CUE can operate with phase failure and
unbalance up to a load of 30 to 40 %.
See section 4.1 Checking the rectifier, static
test.
W/A
5
DC link voltage
high
The intermediate circuit voltage (DC) is higher than
the high voltage warning limit. The limit is
dependent on the drive voltage rating. The
adjustable frequency drive is still active.
Contact Grundfos Service. W
6
DC link voltage
low
The intermediate circuit voltage (DC) is lower than
the low voltage warning limit. The limit is dependent
on the drive voltage rating. The adjustable
frequency drive is still active.
Contact Grundfos Service. W
7 DC overvoltage
If the intermediate circuit voltage exceeds the limit,
the adjustable frequency drive trips after a time
delay.
• Enable the overvoltage control function in
parameter 2-17.
• Extend the ramp deceleration time in
parameter 3-42.
• Increase parameter "14-26 Trip Delay" at
"Inverter Fault".
W/A
8 DC undervoltage
If the intermediate circuit voltage (DC) drops below
the undervoltage limit, the adjustable frequency
drive trips after a fixed time delay. The time delay
varies with unit size.
• Check that the supply voltage matches
the drive voltage.
• Perform an input voltage test.
• Perform a soft-charge circuit test.
W/A
9
Inverter
overloaded
The adjustable frequency drive is about to cut out
because of an overload (too high current for too
long). The counter for electronic, thermal inverter
protection gives a warning at 98 % and trips at 100
%, while giving an alarm. The adjustable frequency
drive cannot be reset until the counter is below 90
%.
The fault is that the adjustable frequency drive is
overloaded by more than 100 % for too long.
• Compare the output current shown on the
operating panel (parameter 16-14) with
the drive rated current (parameter 16-36).
• Display the Inverter Thermal (parameter
16-35) on the operating panel, and
monitor the value. When running above
the drive continuous current rating, the
counter should increase. When running
below the drive continuous current rating,
the counter should decrease.
• Set the Function at Inverter Overload in
parameter "14-61" to "Derate".
See the derating section in the CUE data
booklet for more details if a high switching
frequency is required.
W/A
10
Motor overload
temperature
According to the electronic thermal protection
(ETR), the motor is too hot.
Select whether the adjustable frequency drive gives
a warning or an alarm when the counter reaches
100 % in parameter 1-90 Motor Thermal Protection.
The fault is that the motor is overloaded by more
than 100 % for too long.
• Check if the motor is overheating.
• Check if the motor is mechanically
overloaded.
• Check that the motor parameter "1-24
Motor Current" is set correctly.
• Check that the motor data in parameters
1-20 through 1-25 are set correctly.
• Check the setting in parameter "1-91,
Motor External Fan".
• Run AMA in parameter 1-29.
W/A
Alarm
code
Description Cause Remedy Type
English (GB)
10
11
Motor thermistor
overtemp
The thermistor or the thermistor connection is
disconnected. Select whether the adjustable
frequency drive should give a warning or an alarm
when the counter reaches 100 % in parameter 1-90
Motor Thermal Protection.
• Check if the motor is overheating.
• Check if the motor is mechanically
overloaded.
• Make sure that the thermistor is
connected correctly between terminal 53
or 54 (analog voltage input) and terminal
50 (+10 V supply), or between terminal 18
or 19 (digital input PNP only) and terminal
50.
• If a KTY sensor is used, check for correct
connection between terminal 54 and 55.
• If using a thermal switch or thermistor,
check the programming of parameter 1-93
matches sensor wiring.
• If using a KTY sensor, check the
programming of parameters 1-95, 1-96,
and 1-97 match sensor wiring.
W/A
12 Torque limit
The torque is higher than the value in parameter "4-
16 Torque Limit Motor Mode" (in motor operation),
or the torque is higher than the value in parameter
"4-17 Torque Limit Generator Mode" (in
regenerative operation).
Parameter 14-25 can be used to change this
from a warning only condition to a warning
followed by an alarm.
W/A
13 Overcurrent
The inverter peak current limit, approx. 200 % of the
rated current, is exceeded. The warning lasts about
1.5 sec. Then the adjustable frequency drive trips
and issues an alarm. If extended mechanical brake
control is selected, trip can be reset externally.
• Remove the power from the drive.
• Check that the motor shaft can be turned.
• Check that the motor size matches the
drive.
• Check that the motor data is set correctly
in parameters 1-20 to 1-25.
W/A
14 Earth fault
There is a discharge from the output phases to
earth, either in the cable between the adjustable
frequency drive and the motor or in the motor itself.
Turn off the adjustable frequency drive and
remove the earth fault.
Measure the resistance to earth of the motor
leads and the motor with a megohmmeter to
check for earth faults in the motor.
Perform current sensor test.
A
15
Hardware
mismatch
A fitted option is not operational with the present
control board hardware or software.
Record the value of the following parameters and
contact Grundfos:
15-40 FC Type
15-41 Power Section
15-42 Voltage
15-43 Software Version
15-45 Actual Type code String
15-49 SW ID Control Card
15-50 SW ID Power Card
15-60 Option Mounted (for each option slot)
15-61 Option SW Version (for each option slot)
Contact Grundfos Service. A
16 Short circuit
There is short-circuiting in the motor or on the motor
terminals.
Turn off the adjustable frequency drive and
remove the short circuit.
A
17
Control word
timeout
There is no communication to the adjustable
frequency drive.
The warning will only be active when parameter 8-
04 Control Word Timeout Function is NOT set to
OFF.
If parameter 8-04 Control Word Timeout Function is
set to Stop and Trip, a warning appears and the
adjustable frequency drive ramps down until it trips,
while giving an alarm.
Check the connections on the serial
communication cable.
Increase parameter 8-03 Control Word
Timeout Time.
Check the operation of the communication
equipment.
Verify proper installation based on EMC
requirements.
W/A
18 Start failed
The speed has not been able to exceed parameter
1-77 Compressor Start Max Speed [RPM] during
start within the allowed time that was set in
parameter 1-79 Compressor Start Max Time to Trip.
Check that motor is not blocked. A
21 Parameter error
The parameter is out of range. The parameter
number is shown on the operating panel.
Set the affected parameter to a valid value. W/A
23 Internal fan fault
The fan warning function is an extra protection
function that checks if the fan is running/mounted.
The fan warning can be disabled in parameter 14-53
Fan Monitor ([0] Disabled).
For the D, E, and F Frame drives, the regulated
voltage to the fans is monitored.
Check fan resistance.
Check soft charge fuses.
W
Alarm
code
Description Cause Remedy Type
English (GB)
11
24 External fan fault
The fan warning function is an extra protection
function that checks if the fan is running/mounted.
The fan warning can be disabled in parameter 14-53
Fan Monitor ([0] Disabled).
For the D, E, and F Frame drives, the regulated
voltage to the fans is monitored.
Check fan resistance.
Check soft charge fuses.
W
25
Brake resistor
short circuit
Contact Grundfos Service. W
26
Brake resistor
power limit
Contact Grundfos Service. W/A
27
Brake chopper
fault
Contact Grundfos Service. W/A
28
Brake check
failed
Contact Grundfos Service. W/A
29 Heat sink temp
The maximum temperature of the heat sink has
been exceeded. The temperature fault will not be
reset until the temperature falls below a defined
heat sink temperature. The trip and reset points are
different based on the drive power size.
• The ambient temperature too high.
• Too long motor cable.
• Incorrect clearance above and below the
drive.
• Dirty heat sink.
• Blocked air flow around the drive.
• Damaged heat sink fan.
• For the D, E, and F Frame Drives, this
alarm is based on the temperature
measured by the heat sink sensor
mounted inside the IGBT modules. For
the F Frame drives, this alarm can also be
caused by the thermal sensor in the
Rectifier module.
• Troubleshooting:
• Check fan resistance.
• Check soft charge fuses.
• Check IGBT thermal sensor.
W/A
30
Motor phase U
missing
Motor phase U between the adjustable frequency
drive and the motor is missing.
Turn off the adjustable frequency drive and
check motor phase U.
A
31
Motor phase V
missing
Motor phase V between the adjustable frequency
drive and the motor is missing.
Turn off the adjustable frequency drive and
check motor phase V.
A
32
Motor phase W
missing
Motor phase W between the adjustable frequency
drive and the motor is missing.
Turn off the adjustable frequency drive and
check motor phase W.
A
33 Inrush fault
Too many power-ups have occurred within a short
time period.
Let unit cool to operating temperature. A
34
Fieldbus
communication
fault
The serial communication bus on the
communication option card is not working.
Contact Grundfos Service. W/A
35 Option fault
An option alarm is received. The alarm is option-
specific.
• Wait for 30 seconds until the drive is
completely powered on.
• Check the communication.
W/A
36 Mains failure
This warning/alarm is only active if the supply
voltage to the adjustable frequency drive is lost and
parameter "14-10 Mains Failure" is not set to OFF.
Check the fuses to the adjustable frequency
drive.
W/A
38 Internal fault
• Cycle the power.
• Check that the option is properly installed.
• Check for loose or missing wiring.
• Contact Grundfos Service.
A
39 Heat sink sensor
No feedback from the heat sink temperature sensor.
The signal from the IGBT thermal sensor is not
available on the power card.
• Check the ribbon cable between the
power card and the gate drive card.
• Check for a defective power card.
• Check for a defective gate drive card.
A
40
Overload of
Digital Output
Terminal 27
Terminal 27 is overloaded.
Check the load connected to terminal 27, or
remove short-circuit connection.
Check parameter "5-00 Digital I/O Mode"
and parameter "5-01 Terminal 27 Mode".
W
41
Overload of
Digital Output
Terminal 29
Terminal 29 is overloaded.
Check the load connected to terminal 29, or
remove short-circuit connection.
Check parameter "5-00 Digital I/O Mode"
and parameter "5-02 Terminal 29 Mode".
W
Alarm
code
Description Cause Remedy Type
English (GB)
12
42
Overload of
Digital Output on
X30/6 or
Overload of
Digital Output on
X30/7
For X30/6, check the load connected to X30/6 or
remove short-circuit connection.
Check parameter "5-32 Term X30/6 Digi Out
(MCB 101)".
W
For X30/7, check the load connected to X30/7 or
remove short-circuit connection.
Check parameter "5-33 Term X30/7 Digi Out
(MCB 101)".
45
Protective earth
fault 2
Earth fault
• Check for proper earthing and loose
connections.
• Check for proper wire size.
• Check the motor cables for short circuits
or leakage currents.
A
46
Power card
supply
The supply on the power card is out of range.
• Check for a defective power card.
• Check for a defective control card.
• Check for a defective option card.
• If a 24 V DC supply is used, verify proper
supply power.
A
47 24 V supply low The supply on the power card is out of range. Check for a defective power card. W
48 1.8 V supply low
The 1.8 VDC supply used on the control card is
outside of allowable limits. The power supply is
measured on the control card.
• Check for a defective control card.
• If an option card is present, check for
overvoltage.
W
49 Speed limit
The speed is not within the specified range in
parameter 4-11 Motor Speed Low Limit [RPM] and
parameter 4-13 Motor Speed High Limit [RPM].
• Check the parameters 4-11 and 4-13.
• Check the parameter 1-86.
W
50
AMA calibration
failed
The AMA does not work. Contact Grundfos Service. A
51
AMA check U
nom
and I
nom
The setting of motor voltage, motor current and
motor power is presumably wrong.
Check the settings in parameters 1-20 to 1-
25.
A
52 AMA low I
nom
The motor current is too low.
Check the settings in parameter "1-24 Motor
Current".
A
53
AMA motor too
big
The motor is too big for the AMA to be carried out. Contact Grundfos Service. A
54
AMA motor too
small
The motor is too big for the AMA to be carried out. Contact Grundfos Service. A
55
AMA parameter
out of range
The parameter values found from the motor are
outside the acceptable range.
Contact Grundfos Service. A
56
AMA interrupted
by user
The AMA has been interrupted by the user. Contact Grundfos Service. A
57 AMA timeout
Try to start the AMA again a number of times, until
the AMA is carried out. Please note that repeated
runs may heat the motor to a level where the
resistances R
s
and R
r
are increased. In most cases,
however, this is not critical.
Contact Grundfos Service. A
58
AMA internal
fault
The AMA cannot be implemented. Contact Grundfos Service. A
59 Current limit
The current is higher than the value in parameter "4-
18 Current Limit".
• Ensure that the motor data in parameters
1-20 to 1-25 is set correctly.
• Increase the current limit if necessary.
• Ensure that the system can operate safely
at a higher limit.
W
60 External interlock
A digital input signal indicates a fault condition
external to the drive. An external interlock has
commanded the drive to trip.
Clear the external fault condition. To resume
to normal operation, apply 24 V DC to the
terminal programmed for external interlock,
and reset the drive.
W
61 Feedback error
An error is detected between the calculated speed
and the speed measurement from the feedback
device.
• Check the settings for warning, alarm and
disabling in parameter 4-30 "Motor
Feedback Loss Function".
• Set the tolerable error in parameter "4-31
Motor Feedback Speed Error".
• Set the tolerable feedback loss time in
parameter 4-32 "Motor Feedback Loss
Timeout".
W/A
62
Output frequency
at maximum limit
The output frequency is higher than the value set in
parameter "4-19 Max Output Frequency".
• Check the application for possible
causes.
• Increase the output frequency limit.
Ensure that the system can operate safely
at a higher output frequency.
W
Alarm
code
Description Cause Remedy Type
English (GB)
13
64 Voltage limit
The load and speed combination demands a motor
voltage higher than the actual DC link voltage.
Contact Grundfos Service. W
65
Control Card
Overtemperature
Control card overtemperature: The cut-out
temperature of the control card is 80 °C (176 °F).
• Check that the ambient operating
temperature is within the limits.
• Check for clogged filters.
• Check the fan operation.
• Check the control card.
W/A
66
Heat sink
temperature low
This warning is based on the temperature sensor in
the IGBT module.
• The heat sink temperature measured as 0
°C (32 °F) could indicate that the
temperature sensor is defective, causing
the fan speed to increase to the
maximum. If the sensor wire between the
IGBT and the gate drive card is
disconnected, this warning results.
• Check the IGBT thermal sensor.
W
67
Option module
configuration has
changed
One or more options have either been added or
removed since the last power-down.
Check that the configuration change is
intentional, and reset the unit.
A
68
Safe stop
activated
Safe stop has been activated. To resume normal
operation, apply 24 V DC to terminal 37, then send
a reset signal (via Bus, Digital I/O, or by pressing
the reset key). See parameter 5-19, Terminal 37
Safe Stop.
Check the contacts and switches between
terminals 12/13 and 37.
A
69
Power card
temperature
The temperature sensor on the power card is either
too hot or too cold.
• Check that the ambient operating
temperature is within limits.
• Check for clogged filters.
• Check the fan operation.
• Check the power card.
A
70
Illegal FC
Configuration
The actual combination of control board and power
board is illegal.
Contact Grundfos Service. A
71 PTC 1 safe stop
Safe stop has been activated from the MCB 112
PTC Thermistor Card (motor too warm). Normal
operation can be resumed when the MCB 112
applies 24 V DC to T-37 again (when the motor
temperature reaches an acceptable level), and the
digital input from the MCB 112 is deactivated.
When that happens, a reset signal must be sent (via
serial communication, digital I/O, or by pressing the
reset button on keypad). Note that if automatic
restart is enabled, the motor may start when the
fault is cleared.
Contact Grundfos Service. W/A
72
Dangerous
failure
Safe stop with trip lock. Unexpected signal levels on
safe stop and input from the MCB 112 PTC
thermistor card.
Contact Grundfos Service. A
73
Safe stop auto
restart
The motor is safe-stopped. Note that with automatic
restart enabled, the motor may start when the fault
is cleared.
Check the contacts and switches between
terminals 12/13 and 37.
W
76 Power unit setup
The required number of power units does not match
the detected number of active power units. If the
power card connection is lost, the unit also triggers
this warning.
• Confirm that the spare part and its power
card are the correct part number.
• Ensure that the 44-pin cables between
the MDCIC and power cards are mounted
properly.
W
77
Reduced power
mode
This warning indicates that the drive is operating in
reduced power mode (meaning less than the
allowed number of inverter sections). This warning
is generated on power cycle when the drive is set to
run with fewer inverters and will remain on.
Contact Grundfos Service. W
79
Illegal power
section
configuration
The scaling card is the incorrect part number or not
installed. Also MK102 connector on the power card
could not be installed.
Contact Grundfos Service. A
80
Drive initialized
to default value
Parameter settings are initialised to default settings
after a manual reset.
Contact Grundfos Service. A
81 CSIV corrupt CSIV file has syntax errors. Contact Grundfos Service. A
82
CSIV parameter
error
CSIV failed to initialize a parameter. Contact Grundfos Service. A
91
Analog input 54
wrong settings
Switch S202 has to be set in position OFF (voltage
input) when a KTY sensor is connected to analog
input terminal 54.
Check the dip switch in the drive. A
Alarm
code
Description Cause Remedy Type
English (GB)
14
92 No-flow
A no-load situation has been detected in the
system.
See parameter group 22-2. A
93 Dry pump
A no-flow situation and high speed indicates that the
pump has run dry.
See parameter group 22-2. A
94 End of curve
Feedback stays lower than the setpoint, which may
indicate leakage in the pipe system.
See parameter group 22-5. A
95 Broken belt
Torque is below the torque level set for no-load,
indicating a broken belt.
See parameter group 22-6. A
96 Start delayed
Motor start is delayed due to active short-cycle
protection.
See parameter group 22-7. A
97 Stop delayed
Stopping the motor is delayed due to active short-
cycle protection.
See parameter group 22-7. W
98 Clock fault
The time is not set or RTC clock (if mounted) has
failed.
See parameter group 0-7. W
99 Locked rotor The rotor is blocked. Contact Grundfos Service. A
100 Derag limit fault The deragging feature failed during execution. Check the pump impeller for blockage. A
104 Mixing fan fault
The fan is not operating. The fan monitor checks
that the fan is spinning at power-up or whenever the
mixing fan is turned on. The mixing-fan fault can be
configured as a warning or an alarm trip in
parameter "14-53 Fan Monitor".
Cycle power to the drive to determine if the
warning or alarm returns.
W/A
148
System
temperature
One or more of the system temperature
measurements is too high.
Contact Grundfos Service. W/A
200 Fire mode
The drive is operating in fire mode. The warning
clears when fire mode is removed. Refer to the fire
mode data in the alarm log.
Contact Grundfos Service. W
201
Fire mode was
active
The drive has entered fire mode. Cycle power to the
unit to remove the warning. Refer to the fire mode
data in the alarm log.
Contact Grundfos Service. W
243 Brake IGBT
This alarm is only for multi-drive systems. It is
equivalent to alarm 27, Brake chopper fault.
• The DC fuse is blown.
• The brake jumper is not in position.
• The Klixon switch opened due to an
overtemperature condition in the brake resistor.
The report value in the alarm log indicates
which drive module generated the alarm:
1: Left drive module.
2: Second drive module from left.
3: Third drive module from left (in 4-module
systems).
4: Fourth drive module from left (in 4-module
systems).
A
244
Heat sink
temperature
The maximum temperature of the heat sink has
been exceeded. The temperature fault cannot reset
until the temperature drops below a defined heat
sink temperature.
The trip and reset points are different based on the
power size. This alarm is equivalent to alarm 29,
"Heat Sink Temp".
• Check the ambient temperature, it may be
too high.
• Check the length of the motor cables.
They may be too long.
• Incorrect airflow clearance above or
below the AC drive.
• Check for blocked airflow around the unit.
• Check to see if the heat sink fan is
damaged.
• Check if the heat sink is dirty.
A
245 Heat sink sensor
No feedback from the heat sink temperature sensor.
The signal from the IGBT thermal sensor is not
available on the power card. This alarm is
equivalent to alarm 39, Heat sink sensor.
The report value in the alarm log indicates which
drive module generated the alarm:
1: Left drive module.
2: Second drive module from left.
3: Third drive module from left (in 4-module
systems).
4: Fourth drive module from left (in 4-module
systems).
Check the following:
• Power card.
• Gate drive card.
• Ribbon cable between the power card and
the gate drive card.
A
Alarm
code
Description Cause Remedy Type
English (GB)
15
246
Power card
supply
This alarm is only for multi-drive systems. It is
equivalent to alarm 46, Power card supply. The
report value in the alarm log indicates which drive
module generated the alarm:
1: Left drive module.
2: Second drive module from left.
3: Third drive module from left (in 4-module
systems)
4: Fourth drive module from left (in 4-module
systems).
Check the steps for alarm 46. A
247
Power card
temperature
This alarm is only for multi-drive systems. It is
equivalent to alarm 69, Power card temperature.
The report value in the alarm log indicates which
drive module generated the alarm:
1: Left drive module.
2: Second drive module from left.
3: Third drive module from left (in 4-module
systems).
4: Fourth drive module from left (in 4-module
systems).
Check the steps for alarm 69. A
248
Illegal power
section
configuration
This alarm is only for F-frame drives. It is equivalent
to Alarm 79. The report value in the alarm log
indicates which power module generated the alarm:
1: Left most inverter module.
2: Middle inverter module in F2 or F4 drive.
3: Right inverter module in F1 or F3 drive.
4: Right inverter module in F2 or F4 drive.
5: Rectifier module.
Check the steps for alarm 79. A
249
Temperature of
the rectifier heat
sink
This alarm is only for multi-drive systems. It is
equivalent to alarm 79, Illegal power section
configuration. The report value in the alarm log
indicates which drive module generated the alarm:
1: Left drive module.
2: Second drive module from left.
3: Third drive module from left (in 4-module
systems).
4: Fourth drive module from left (in 4-module
systems).
Check the steps for alarm 79. A
250 New spare part
The power or switch mode power supply has been
exchanged. The adjustable frequency drive type
code must be restored in EEPROM.
Select the correct type code in parameter
"14-23 Typecode Setting" according to the
label on the unit. Remember to select "Save
to EEPROM" to complete.
W
251 New type code
The power card or other components have been
replaced and the type code has been changed.
Reset to remove the warning and to resume
normal operation.
w
274
The flow is not
confirmed
A signal from an external device, for example flow
switch, was not received within the time specified in
parameter 29-50 after start signal (startup
monitoring). It could be caused by for example a
defective flow switch, defective pump, closed inlet
valve, no water on the inlet side.
Run the pump (carefully) in Hand mode, to
see if there actually is flow in the system.
Subsequently check the functionality of the
flow switch.
A
275
Flow switch
failure
A signal from an external device (flow switch) was
not received or lost during a running condition, see
parameter 29-52.
It could be caused by defective flow switch,
defective pump, closed inlet valve, no water on the
inlet side.
Run the pump (carefully), to see if there
actually is flow in the system. Subsequently
check the functionality of the flow switch.
A
Alarm
code
Description Cause Remedy Type
English (GB)
16
2004 External fault
One of the digital inputs
• DI2 (see display 3.9)
• DI3 (see display 3.10)
• DI4 (see display 3.11) is set to External fault, and
the input has been or is still closed.
Check if the digital input set to External fault
is open or closed.
• If the input is closed, reset the alarm
cause in the external control circuit.
• If the input is open (there is no fault signal
from the external control circuit):
– Pull the terminal block for the external
input signals out of CUE.
• If the warning disappears, the fault is
overload in the control circuit for the
external setpoint.
• If the warning does not disappear, contact
Grundfos Service.
See section 4.4 Checking the intermediate
voltage.
A
2007
Too high bearing
temperature
The D-end motor bearing is too hot. The motor
cooling is not at optimum:
a) The motor is so dirty that optimum cooling
cannot be achieved.
Clean the motor.
W
b) The fan is so dirty that optimum cooling cannot
be achieved.
Replace the fan.
c) The bearing is not lubricated correctly. Check the lubrication of the bearing.
This is the normal state if the temperature
exceeds the factory setting selected for the
motor.
2008
Too high bearing
temperature
The ND-end motor bearing is too hot.
Motor cooling is not at optimum:
a) The motor is so dirty that optimum cooling
cannot be achieved.
Clean the motor.
A
b) The fan is so dirty that optimum cooling cannot
be achieved.
Replace the fan.
c) The bearing is not lubricated correctly. Check the lubrication of the bearing.
This is the normal state if the temperature
exceeds the factory setting selected for the
motor.
2010
Setpoint signal
outside range
External setpoint (terminal 53):
The external setpoint has fallen below these control
values for more than 500 ms:
Type: 4-20 mA: Alarm under 2 mA (reset over 3
mA).
Type: 2-10 V: Alarm under 1 V (reset over 1.5 V).
The types 0-20 mA and 0-10 V are not monitored.
A
Fault at startup:
a) The setting of contact A53 for selection of signal
type is incorrect.
Set the contact correctly according to the
settings in the CUE installation and
operating instructions.
b) The setting in display "3.3 Ext. setpoint" is not
correct for the signal in question.
Correct the sensor setting.
c) The connection of the external setpoint signal is
incorrect.
Correct the setpoint signal.
d) The signal transmitter or the signal cable
defective.
If the signal transmitter or cable is defective,
replace the defective part.
Fault after startup:
a) Missing voltage supply to the external setpoint
signal.
Check if the voltage supply is connected.
See the CUE installation and operating
instructions for further information.
Alarm
code
Description Cause Remedy Type
English (GB)
17
2011
Sensor 1
outside range
Sensor 1 (terminal 54):
The analog input signal has fallen below these
control values for more than 500 ms:
Type: 4-20 mA: Alarm under 2 mA (reset over 3
mA).
Type: 2-10 V: Alarm under 1 V (reset over 1.5 V).
The types 0-20 mA and 0-10 V are not monitored.
A
Fault at startup:
a) No sensor is connected. Connect a sensor according to the section
"Connecting the signal terminals" in the
CUE installation and operating instructions.
b) The setting of contact A54 for selection of signal
type is incorrect.
Set the contact correctly according to the
settings in the CUE installation and
operating instructions.
3. The setting in display 3.15 is incorrect. Correct the sensor setting.
c) The sensor connection is incorrect. Connect the sensor correctly according to
the section "Connecting the signal
terminals" in the CUE installation and
operating instructions.
d) The alarm is given during the startup guide if an
operating mode with sensor has been selected,
and no sensor is connected.
Go through the startup guide again, and
select an operating mode that does not
require a sensor.
e) Missing voltage supply to the sensor. Check that there are 24 ± 1 V DC between
terminals 12 and 55:
• If the voltage is not okay, see section
4.4 Checking the intermediate voltage.
If the voltage is okay, remove the wire from
terminal 55, and check that there are
minimum 2 mA or 1 V between terminal 55
and the wire. If yes, see section
4.4 Checking the intermediate voltage.
Fault after startup:
a) Sensor or sensor cable defective. If the cable or sensor is defective, replace
the defective part.
2012
Sensor 2
outside range
Sensor input 2 (terminal 2 of the MCB 114) is or has
been under the control value.
Type: 4-20 mA: Alarm under 2 mA (reset over 3
mA).
A
Fault at startup:
a) The CUE menu setting does not match the
sensor type installed.
Check the setting in display "3.16 Sensor 2".
b) The sensor connection is incorrect. Check the connection according to the
wiring diagram for MCB 114 in the CUE
installation and operating instructions.
c) Sensor or sensor cable defective. If the cable or sensor is defective, replace
the defective part.
Fault after startup:
a) Missing voltage supply to the sensor. Check that there are 24 ± 1 V DC between
terminals 1 and 3 of the MCB 114
• If the voltage is okay, remove the wire
from terminal 2, and check that there are
minimum 2 mA between terminal 3 and
the wire.
Alarm
code
Description Cause Remedy Type
English (GB)
18
2013
Temperature
sensor 1
outside range
The temperature sensor connected to terminal 5 in
the MCB 114 sensor input module measures a value
under -50 °C or over 200 °C.
A
a) The sensor connection is incorrect. Check the connection according to the CUE
installation and operating instructions.
b) The sensor is defective. Measure the sensor resistance using an
ohmmeter:
• Type Pt100:
If the resistance is less than 80 ohm
(corresponding to -50 °C) or greater than
240 ohm (corresponding to 200 °C), the
sensor is defective and must be replaced.
At 20 °C, the resistance must be 107
ohm.
• Type Pt1000:
If the resistance is less than 800 ohm
(corresponding to -50 °C) or greater than
1773 ohm (corresponding to 200 °C), the
sensor is defective and must be replaced.
At 20 °C, the resistance must be 1077
ohm.
2014
Temperature
sensor 2
outside range
The temperature sensor connected to terminal 8 in
the MCB 114 sensor input module measures a value
under -50 °C or over 200 °C.
A
a) The sensor connection is incorrect. Check the MCB 114 sensor input
connection. See the CUE installation and
operating instructions for further details.
b) The sensor is defective. Measure the sensor resistance using an
ohmmeter:
• Type Pt100:
If the resistance is less than 80 ohm
(corresponding to -50 °C) or greater than
240 ohm (corresponding to 200 °C), the
sensor is defective and must be replaced.
At 20 °C, the resistance must be 107
ohm.
• Type Pt1000:
If the resistance is less than 800 ohm
(corresponding to -50 °C) or greater than
1773 ohm (corresponding to 200 °C), the
sensor is defective and must be replaced.
At 20 °C, the resistance must be 1077
ohm.
2016
Limit 1
exceeded
This is a monitoring function offering information,
warning or alarm if a low or high limit is exceeded.
The function can only be set by means of Grundfos
PC Tool E-Products.
The function can be set to monitor the
following:
– sensor 1 or 2
– external setpoint or
– temperature sensor 1 or 2.
Procedure:
1. Using PC Tool E-Products, check which
function is being monitored.
2. Check in the pump system whether the
alarm or warning is real. If it is real,
remedy the fault.
3. If the alarm or warning seems to be
wrong for the pump system, troubleshoot
according to the selected sensor using
this manual.
W/A
2017
Limit 2
exceeded
Alarm
code
Description Cause Remedy Type
English (GB)
19
Overload alarms
Fig. 7 Overload alarms
4. Checking the mains components
The check of the mains components of CUE is divided into these
single
procedures:
4.1 Checking the rectifier, static test
4.2 Checking the IGBTs, static test
4.3 Checking the IGBTs, dynamic test
4.4 Checking the intermediate voltage
4.5 Checking the current sensor
4.6 Setting the type code.
TM04 1969 1508
I
motor
I
CUE, 1 minute
- 110 %
I
short
I
CUE
- 200 %
I
CUE, max.
- 100 %
I
motor
<= I
CUE, max.
(nameplate)
48/1
0 Overload, thermal
55/12 Overload, torque
55/59 Overload, current
The pump is overloaded, but the alarm is
not active yet.
48/9
49/13
48/16
If it is necessary to replace rectifiers and/or IGBTs, it
is important to clean the heat sink of old cooling
paste and apply an even layer of new cooling paste
over the entire heat sink. Some CUE enclosures
have rectifiers and IGBTs on the power board.
English (GB)
20
4.1 Checking the rectifier, static test
Always carry out the static test of the rectifier after each repair.
Before beginning the test:
1. Switch off the mains supply.
2. Remove the supply cable.
3. Set the multimeter to diode test.
The position of the terminals DC+ and DC- differs from enclosure
to enclosure.
Measurement on diodes and thyristors
Note that the diodes are not fitted directly on the terminals where
the measurement takes place. OL (Open Line, i.e. no connection)
may therefore indicate an interruption between the terminal and
diode. Check this before replacing the diode or the board where
the diode is fitted.
Diode drop voltage approx. 0.4
V; < 0.3 V or > 0.5 V: Diode
defective.
OL: Diode blocked = OK.
Other indication: Diode
defective.
OL: Thyristor blocked = OK.
Other indication: Diode
defective.
OL: Thyristor blocked = OK.
Other indication: Diode
defective.
Enclosures A2, A3, A5, B3
TM03 9014 2807
Measurements
Step 1 Step 2 Step 3 Step 4
+DC - +
-DC + -
L1 + - - +
L2 + - - +
L3 + - - +
Indication 0.4 OL 0.4 OL
+ = positive test pin
- = negative test pin
Terminals in enclosures A2 and A3 (shown with
mains supply cable connected).
Enclosures A5 and B3 have similar terminals.
Enclosures B1, B2
Measurements
Step 1 Step 2 Step 3 Step 4
DC+ - +
DC- + -
L1 + - - +
L2 + - - +
L3 + - - +
Indication 0.4 OL 0.4 OL
+ = positive test pin
- = negative test pin
Enclosure B4
Measurements
Step 1 Step 2 Step 3 Step 4
DC+ - +
DC- + -
L1 + - - +
L2 + - - +
L3 + - - +
Indication 0.4 OL 0.4 OL
+ = positive test pin
- = negative test pin
+DC
-DC
+DC
-DC
DC-
DC+
+DC
-DC
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Grundfos CUE Series Service Instructions Manual

CUE Series
Grundfos
Brand
Grundfos
Model
CUE Series
Type
Service Instructions Manual
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